sha512: add ARM/NEON assembly version of transform function
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Description

sha512: add ARM/NEON assembly version of transform function

* cipher/Makefile.am: Add 'sha512-armv7-neon.S'.
* cipher/sha512-armv7-neon.S: New file.
* cipher/sha512.c (USE_ARM_NEON_ASM): New macro.
(SHA512_CONTEXT) [USE_ARM_NEON_ASM]: Add 'use_neon'.
(sha512_init, sha384_init) [USE_ARM_NEON_ASM]: Enable 'use_neon' if
CPU support NEON instructions.
(k): Round constant array moved outside of 'transform' function.
(__transform): Renamed from 'tranform' function.
[USE_ARM_NEON_ASM] (_gcry_sha512_transform_armv7_neon): New prototype.
(transform): New wrapper function for different transform versions.
(sha512_write, sha512_final): Burn stack by the amount returned by
transform function.
* configure.ac (sha512) [neonsupport]: Add 'sha512-armv7-neon.lo'.

Add NEON assembly for transform function for faster SHA512 on ARM. Major speed
up thanks to 64-bit integer registers and large register file that can hold
full input buffer.

Benchmark results on Cortex-A8, 1Ghz:

Old:
$ tests/benchmark --hash-repetitions 100 md sha512 sha384
SHA512 17050ms 18780ms 29120ms 18040ms 17190ms
SHA384 17130ms 18720ms 29160ms 18090ms 17280ms

New:
$ tests/benchmark --hash-repetitions 100 md sha512 sha384
SHA512 3600ms 5070ms 15330ms 4510ms 3480ms
SHA384 3590ms 5060ms 15350ms 4510ms 3520ms

New vs old:
SHA512 4.74x 3.70x 1.90x 4.00x 4.94x
SHA384 4.77x 3.70x 1.90x 4.01x 4.91x